Which component in the network is defined as the Cable Modem Termination System and what does it do?

Which component in the network is defined as the Cable Modem Termination System and what does it do?

• A. The gateway at the customer premises that provides Wi-Fi
• B. The headend that encodes video
• C. The service drop from the utility
• D. Cable Modem Termination System; routes data between cable modems and the IP network

Answer: (D)

The key idea is how the network connects cable modems to the Internet: the Cable Modem Termination System sits at the provider’s headend and acts as the gateway between the RF cable plant and the IP network. It terminates the DOCSIS connections from all cable modems, handles the framing and modulation of downstream traffic onto the coax, and collects upstream data from modems to forward into the IP backbone. In short, it coordinates and routes data between the cable modems and the IP network, enabling Internet access for all subscribers. Other options don’t fit because a customer-premises gateway primarily provides local Wi‑Fi and routing inside the home, not the network-facing termination point. The headend that encodes video is part of video distribution, not the data path for Internet traffic. The service drop is just the physical connection from the utility to the premises, not a data-routing device.

The key idea is how the network connects cable modems to the Internet: the Cable Modem Termination System sits at the provider’s headend and acts as the gateway between the RF cable plant and the IP network. It terminates the DOCSIS connections from all cable modems, handles the framing and modulation of downstream traffic onto the coax, and collects upstream data from modems to forward into the IP backbone. In short, it coordinates and routes data between the cable modems and the IP network, enabling Internet access for all subscribers.

Other options don’t fit because a customer-premises gateway primarily provides local Wi‑Fi and routing inside the home, not the network-facing termination point. The headend that encodes video is part of video distribution, not the data path for Internet traffic. The service drop is just the physical connection from the utility to the premises, not a data-routing device.